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@bhargav khanpara • 15 Oct, 2013
WHY SOMETIMES WE GIVING CHOCK TO VEHICLE
@Sarathkumar Chandrasekaran • 15 Oct, 2013
bhargav khanpara
WHY SOMETIMES WE GIVING CHOCK TO VEHICLE
Hi @bharghav Khanpura Its not "chock" and it's "choke".
Chokes are widely used in bikes especially during the startup of a bike in cold condition to start the ignition. When we pull the choke, The butterfly valve in the carburetor helps in supplying rich mixture(high fuel and less air mixture) so that combustion happens with ease.When we pull the choke , the butterfly valve will be in upright position.Hope you understand.If doubt arises please ask.1CE109400FG0010
@lal • 15 Oct, 2013 So, when we use choke, just the air flow reduces? Or will there be any increase in the fuel inflow too?
@Sarathkumar Chandrasekaran • 15 Oct, 2013 • 2 likes
lal
So, when we use choke, just the air flow reduces? Or will there be any increase in the fuel inflow too?
Yes you are correct.Its not just about the closure of air flow but also the addition of fuel into the carburetor. This happens by the process where when we pull the choke ,The butterfly valve closes the air flow which makes the pressure difference inside the carbuteror and this leads to sucking of more fuel into the carburetor .So in this process we get a air fuel mixture rich with fuel to overcome coldstarting.
@Anand Tamariya • 15 Oct, 2013 A related question would be - why should choke not be used for normal functioning after engine start?
@Sarathkumar Chandrasekaran • 16 Oct, 2013
Anand Tamariya
A related question would be - why should choke not be used for normal functioning after engine start?
The answer is simple.If we use choke after you get a good start , It Will lead to high fuel consumption because when we pull the choke after start, a high air fuel mixture rich in fuel Will enter into engines via inlet valve from carburetor.As a result there is a high fuel consumption .So it is better to avoid choke after a good start.
@Saandeep Sreerambatla • 16 Oct, 2013 • 1 like No its not only high fuel consumption, whenever you use choke when the vehicle is running, most of the vehicles stop.

Because, the choke injects high fuel and less air, this makes the engine stall as there will be no air for burning the fuel. I have tried this practically many times and it works.
@vikaskumar11233 • 17 Oct, 2013
Anand Tamariya
A related question would be - why should choke not be used for normal functioning after engine start?
Well the choke is only used when required because the normal use of furl is easily available by the fuel tank. But the case comes when the vehicle doesn't comes up with normal fuel available. That's why choke is used to provide more than required fuel to the engine that make it to start well.
Choke is only made for emergency issues.
@Teja Reddy • 27 Feb, 2020 • 1 like

Motorcycle choke is nothing but a pulling lever attached with the carburetor. It may have attached directly with carburetor or may have set on handle bar or on front panel but connected with the carburetor with a cable. Wherever the lever has set it directly operates a valve of carburetor and the full assembly called as choke.

qSiL-1582806395288.jpg

In early days it was somewhat essential pulling the choke lever out for starting a cold engine. It was quite necessary pulling the choke in the morning to start a cold engine. In summer I may not need so frequently but in winter sometimes it needed pulling the lever every time when starting.

Therefore whatever the time or weather it needed to start a cold engine the question is, what is the reason or what is the purpose of choke? And what the roll it plays on starting a cold engine?

Yes choke lever directly increases the fuel ratio in air-fuel mixture.  In carburetor chock lever operates a valve or gate to control air or fuel to rich the fuel in the mixture.

The chock lever mechanism works to increase fuel or decrease the air ratio in the supply. Thus the chock instantly riches the air-fuel mixture and helps to quick ignition in cold engine. So that is the purpose or roll of a chock lever.

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